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Thorsten wrote:

First, the Lowther has ze wizzer cut off and has an Equalisation circuit to flatten ze upper midrange bump. Otherwise it is run fullrange, that is WITHOUT HIGHPASS OR LOWPASS.

Probably this is why the Lowther sounded within the Hoerning’s so stressed and with a huge tendency to suffocation and choking. Regarding the absents of the band-pass filters… Perhaps you are correct. However, they use Lowther DXII that runs up to 6-7kHz. Probably they let the Lowther decay I upper knew naturally, which is fine. The lower knee in their Lowther quite low and they truncated it at 200Hz. it is what I remember they told at the manufacturer web site. (sorry, I can bring the direct quote as thier site is down) I was quite surprised when I read it, as 200Hz is too high for those 12" Beyma to handle. Subjectively I would estimate that thier Lowther works way lower but I do not know how low. This what and why I was asking the sales rep.  BTW, an “equalization circuit to flatten ze upper midrange bump” destroys sounds order of magnetite heavier then a 6dB filter. In fact an opened first order has no effect to sound besides the sound of the cup. Why the industry created the faulty paranoia that a 6dB filter is bad but the idiotic structure-of-sound-destroying resonators are good is way beyond my understanding.

Thorsten wrote:

Secondly, the Hoerning principle is actually more accuratly a dual folded TQWT, not a horn. The TQWT housing the Lowther and that housing the rear mounted woofer are of different length and are in effect mounted back to back. However, the division between the two end sections of the two TQWT's is missing and thus in effect there is just one "horn mouth" and beyond a certain point the horn becomes one. So, if we want to view the Hoernings as Horns we have a split throat single horn.

OK, it makes sense. Interestingly I never seen the Hoerning principle explanation as TQWT loaded with two drivers according to Horns and Voight Pipes concepts. How, difficult for that rep at the show would be juts to mention it?

Thorsten wrote:

Crossovers on woofer and tweeter are 1st order and the woofer(s) carry on quite high up in frequency to support the Lowthers lower midrange.

Hm, a non-truncated Lowther in TQWT application should go all the way down to ~50-60Hz, even if they killed with the “equalization circuit” the typical for TQWT combfilter resonances. So, how come that the “woofers carry on quite high”? If the story about 200Hz is correct then what holds the Lowther in TQWT do not go all the way down?

Rgs,
The caT

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